/**
 * Copyright (c) 2010 Anders Ekdahl (http://coffeescripter.com/) Dual licensed
 * under the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL
 * (http://www.opensource.org/licenses/gpl-license.php) licenses.
 * 
 * Version: 1.2.4
 * 
 * Demo and documentation: http://coffeescripter.com/code/ad-gallery/
 */
(function($) {
	$.fn.adGallery = function(options) {
		var defaults = {
			loader_image : options.loader_image || 'lib/images/gallery/loader.gif',
			start_at_index : 0,
			description_wrapper : false,
			thumb_opacity : 0.7,
			animate_first_image : false,
			animation_speed : 400,
			width : false,
			height : false,
			display_next_and_prev : true,
			display_back_and_forward : true,
			scroll_jump : 0, // If 0, it jumps the width of the container
			slideshow : {
				enable : true,
				autostart : false,
				speed : 5000,
				start_label : 'Start',
				stop_label : 'Stop',
				stop_on_scroll : true,
				countdown_prefix : '(',
				countdown_sufix : ')',
				onStart : false,
				onStop : false
			},
			effect : 'slide-hori', // or 'slide-vert', 'fade', or 'resize',
									// 'none'
			enable_keyboard_move : true,
			cycle : true,
			callbacks : {
				init : false,
				afterImageVisible : false,
				beforeImageVisible : false
			}
		};
		var settings = $.extend(false, defaults, options);
		if (options && options.slideshow) {
			settings.slideshow = $.extend(false, defaults.slideshow,
					options.slideshow);
		}
		;
		if (!settings.slideshow.enable) {
			settings.slideshow.autostart = false;
		}
		;
		var galleries = [];
		$(this).each(function() {
			var gallery = new AdGallery(this, settings);
			galleries[galleries.length] = gallery;
		});
		// Sorry, breaking the jQuery chain because the gallery instances
		// are returned so you can fiddle with them
		return galleries;
	};

	function VerticalSlideAnimation(img_container, direction, desc) {
		var current_top = parseInt(img_container.css('top'), 10);
		if (direction == 'left') {
			var old_image_top = '-' + this.image_wrapper_height + 'px';
			img_container.css('top', this.image_wrapper_height + 'px');
		} else {
			var old_image_top = this.image_wrapper_height + 'px';
			img_container.css('top', '-' + this.image_wrapper_height + 'px');
		}
		;
		if (desc) {
			desc.css('bottom', '-' + desc[0].offsetHeight + 'px');
			desc.animate({
				bottom : 0
			}, this.settings.animation_speed * 2);
		}
		;
		if (this.current_description) {
			this.current_description.animate({
				bottom : '-' + this.current_description[0].offsetHeight + 'px'
			}, this.settings.animation_speed * 2);
		}
		;
		return {
			old_image : {
				top : old_image_top
			},
			new_image : {
				top : current_top
			}
		};
	}
	;

	function HorizontalSlideAnimation(img_container, direction, desc) {
		var current_left = parseInt(img_container.css('left'), 10);
		//console.log(img_container);
		var ct_width = parseFloat(img_container.width(), 50);
		var old_image_left;
		if (direction == 'left') {
			old_image_left = '-' + ct_width + 'px';
			img_container.css('left', ct_width + 'px');
		} else {
			old_image_left = ct_width/10 + 'px';
			img_container.css('left', '-' + ct_width + 'px');
		}
		;
		if (desc) {
			desc.css('bottom', '-' + desc[0].offsetHeight + 'px');
			desc.animate({
				bottom : 0
			}, this.settings.animation_speed * 2);
		}
		;
		if (this.current_description) {
			this.current_description.animate({
				bottom : '-' + this.current_description[0].offsetHeight + 'px'
			}, this.settings.animation_speed * 2);
		}
		;
		return {
			old_image : {
				left : old_image_left
			},
			new_image : {
				left : current_left
			}
		};
	}
	;

	function ResizeAnimation(img_container, direction, desc) {
		var image_width = img_container.width();
		var image_height = img_container.height();
		var current_left = parseInt(img_container.css('left'), 10);
		var current_top = parseInt(img_container.css('top'), 10);
		img_container.css({
			width : 0,
			height : 0,
			top : this.image_wrapper_height / 2,
			left : this.image_wrapper_width / 2
		});
		return {
			old_image : {
				width : 0,
				height : 0,
				top : this.image_wrapper_height / 2,
				left : this.image_wrapper_width / 2
			},
			new_image : {
				width : image_width,
				height : image_height,
				top : current_top,
				left : current_left
			}
		};
	}
	;

	function FadeAnimation(img_container, direction, desc) {
		img_container.css('opacity', 0);
		return {
			old_image : {
				opacity : 0
			},
			new_image : {
				opacity : 1
			}
		};
	}
	function MixSlideFadeAnimation(img_container, direction, desc) {
		var slide_ret = HorizontalSlideAnimation(img_container, direction, desc);
		var fade_ret = FadeAnimation(img_container, direction, desc);
		var old_left = parseFloat(slide_ret.old_image.left) / 3;
		var new_left = parseFloat(slide_ret.new_image.left) / 4;
		return {
			old_image : {
				opacity : fade_ret.old_image.opacity,
				left: old_left + "px"
			},
			new_image : {
				opacity : fade_ret.new_image.opacity,
				left: new_left + "px"
			}
		};
	}

	// Sort of a hack, will clean this up... eventually
	function NoneAnimation(img_container, direction, desc) {
		img_container.css('opacity', 0);
		return {
			old_image : {
				opacity : 0
			},
			new_image : {
				opacity : 1
			},
			speed : 0
		};
	}
	;

	function AdGallery(wrapper, settings) {
		this.init(wrapper, settings);
	}
	;
	AdGallery.prototype = {
		// Elements
		wrapper : false,
		image_wrapper : false,
		gallery_info : false,
		nav : false,
		loader : false,
		preloads : false,
		thumbs_wrapper : false,
		scroll_back : false,
		scroll_forward : false,
		next_link : false,
		prev_link : false,

		slideshow : false,
		image_wrapper_width : 0,
		image_wrapper_height : 0,
		current_index : 0,
		current_image : false,
		current_description : false,
		nav_display_width : 0,
		nav_display_height: 0,
		settings : false,
		images : false,
		in_transition : false,
		animations : false,
		init : function(wrapper, settings) {
			var context = this;
			this.wrapper = $(wrapper);
			this.settings = settings;
			this.setupElements();
			this.setupAnimations();
			if (this.settings.width) {
				this.image_wrapper_width = this.settings.width;
				this.image_wrapper.width(this.settings.width);
				this.wrapper.width(this.settings.width);
			} else {
				this.image_wrapper_width = this.image_wrapper.width();
			}			
			if (this.settings.height) {
				this.image_wrapper_height = this.settings.height;
				this.image_wrapper.height(this.settings.height);
			} else {
				this.image_wrapper_height = this.image_wrapper.height();
			}
			;
			this.nav_display_width = this.nav.width();
			this.nav_display_height = this.nav.height();
			//console.log("this.nav_display_height=" + this.nav_display_height);
			this.current_index = 0;
			this.current_image = false;
			this.current_description = false;
			this.in_transition = false;
			
			// The slideshow needs a callback to trigger the next image to be
			// shown
			// but we don't want to give it access to the whole gallery instance
			var nextimage_callback = function(callback) {
				return context.nextImage(callback);
			};
			this.slideshow = new AdGallerySlideshow(nextimage_callback,
					this.settings.slideshow);
			this.controls.append(this.slideshow.create());
			if (this.settings.slideshow.enable) {
				this.slideshow.enable();
			} else {
				this.slideshow.disable();
			}
			if (this.settings.display_back_and_forward) {
				this.initBackAndForward();
			}
			if (this.settings.enable_keyboard_move) {
				this.initKeyEvents();
			}
			var start_at = parseInt(this.settings.start_at_index, 10);
			if (window.location.hash
					&& window.location.hash.indexOf('#ad-image') === 0) {
				start_at = window.location.hash.replace(/[^0-9]+/g, '');
				// Check if it's a number
				if ((start_at * 1) != start_at) {
					start_at = this.settings.start_at_index;
				}
			}
			
			if(this.settings.autoload == true)
			{
				this.load_images(start_at);
			}			
			this.fireCallback(this.settings.callbacks.init);
		},
		preload_all_images: function() {
			for(var i=0;i < this.images.length; i++){
				this.preloadImage(i);
			}
		},
		load_images: function(start_at) {
			this.findImages();
			
			if (this.settings.display_next_and_prev) {
				this.initNextAndPrev();
			}
			var context = this;
			
			this.image_wrapper.append(this.loader);
			this.loading(true);
			this.showImage(start_at, function() {
				// We don't want to start the slideshow before the image has
				// been
				// displayed
				if (context.settings.slideshow.autostart) {
					context.preloadImage(start_at + 1);
					context.slideshow.start();
				}
			});
			if(this.settings.nopreload != true){
				this.preload_all_images();
			}
		},
		setupAnimations : function() {
			this.animations = {
				'slide-vert' : VerticalSlideAnimation,
				'slide-hori' : HorizontalSlideAnimation,
				'resize' : ResizeAnimation,
				'fade' : FadeAnimation,
				'mix-slide-fade' : MixSlideFadeAnimation,
				'none' : NoneAnimation
			};
		},
		setupElements : function() {
			this.controls = this.wrapper.find('.ad-controls');
			this.gallery_info = $('<p class="ad-info"></p>');
			this.controls.append(this.gallery_info);
			this.image_wrapper = this.wrapper.find('.ad-image-wrapper');
			this.image_wrapper.empty();
			this.nav = this.wrapper.find('.ad-nav');
			this.thumbs_wrapper = this.nav.find('.ad-thumbs');
			this.preloads = $('<div class="ad-preloads"></div>');
			this.loader = $('<img class="ad-loader" src="'
					+ this.settings.loader_image + '">');
			//this.image_wrapper.append(this.loader);
			this.loader.hide();
			$(document.body).append(this.preloads);
		},
		loading : function(bool) {
			if (bool) {
				this.loader.show();
			} else {
				this.loader.hide();
			}
			;
		},
		addAnimation : function(name, fn) {
			if ($.isFunction(fn)) {
				this.animations[name] = fn;
			}
			;
		},
		findImages : function() {
			var context = this;
			this.images = [];
			var thumb_wrapper_width = 0;
			var thumb_wrapper_height = 0;
			var thumbs_loaded = 0;
			//console.log("thumbs_wrapper=");
			//console.log(this.thumbs_wrapper);
			
			var thumbs = this.thumbs_wrapper.find('a');								
			var thumb_count = thumbs.length;
			//console.log("thumbs.length=" + thumb_count);
			
			//console.log(thumbs);
			//console.log("this.settings.thumb_opacity=" + this.settings.thumb_opacity);
			if (this.settings.thumb_opacity < 1) {
				thumbs.find('img').css('opacity', this.settings.thumb_opacity);
			}
			//console.log(thumbs);
			thumbs
					.each(function(i) {
						var link = $(this);
						var image_src = link.attr('href');
						var thumb = link.find('img');
						// Check if the thumb has already loaded
						if (!context.isImageLoaded(thumb[0])) {
							thumb
									.load(function() {
										thumb_wrapper_width += this.parentNode.parentNode.offsetWidth;
										thumb_wrapper_height += this.parentNode.parentNode.offsetHeight;
										thumbs_loaded++;
									});
						} else {
							thumb_wrapper_width  += thumb[0].parentNode.parentNode.offsetWidth;
							thumb_wrapper_height += thumb[0].parentNode.parentNode.offsetHeight;
							thumbs_loaded++;
						}
						;
						link.addClass('ad-thumb' + i);
						link
								.click(function() {
									context.showImage(i);
									context.slideshow.stop();
									return false;
								})
								.hover(
										function() {
											if (!$(this).is('.ad-active')
													&& context.settings.thumb_opacity < 1) {
												$(this).find('img').fadeTo(300,
														1);
											}
											;
											context.preloadImage(i);
										},
										function() {
											if (!$(this).is('.ad-active')
													&& context.settings.thumb_opacity < 1) {
												$(this)
														.find('img')
														.fadeTo(
																300,
																context.settings.thumb_opacity);
											}
											;
										});
						var link = false;
						if (thumb.data('ad-link')) {
							link = thumb.data('ad-link');
						} else if (thumb.attr('longdesc')
								&& thumb.attr('longdesc').length) {
							link = thumb.attr('longdesc');
						}
						;
						var desc = false;
						if (thumb.data('ad-desc')) {
							desc = thumb.data('ad-desc');
						} else if (thumb.attr('alt')
								&& thumb.attr('alt').length) {
							desc = thumb.attr('alt');
						}
						;
						var title = false;
						if (thumb.data('ad-title')) {
							title = thumb.data('ad-title');
						} else if (thumb.attr('title')
								&& thumb.attr('title').length) {
							title = thumb.attr('title');
						}
						;
						context.images[i] = {
							thumb : thumb.attr('src'),
							image : image_src,
							error : false,
							preloaded : false,
							desc : desc,
							title : title,
							size : false,
							link : link
						};
					});
			// Wait until all thumbs are loaded, and then set the width of the
			// ul
			if(this.settings.thumb_vertical != true) {
				var inter = setInterval(function() {				
						if (thumb_count == thumbs_loaded) {
							thumb_wrapper_width -= 100;
							var list = context.nav.find('.ad-thumb-list');
							list.css('width', thumb_wrapper_width + 'px');
							var i = 1;
							var last_height = list.height();
							while (i < 201) {
								list.css('width', (thumb_wrapper_width + i) + 'px');
								if (last_height != list.height()) {
									break;
								}
								last_height = list.height();
								i++;
							}
							clearInterval(inter);
						}
				}, 100);
			} else {
				var thumb_ct_size = this.settings.thumb_ct_size;
				var inter = setInterval(function() {				
						if (thumb_count == thumbs_loaded) {
							thumb_wrapper_height -= 100;
							var list = context.nav.find('.ad-thumb-list');
							//list.css('height', thumb_wrapper_height + 'px');
							list.css('height', thumb_ct_size + 'px');
							
//							var i = 1;
//							var last_height = list.height();
//							while (i < 201) {
//								list.css('height', (thumb_wrapper_height + i) + 'px');
//								if (last_height != list.height()) {
//									break;
//								}
//								last_height = list.height();
//								i++;
//							}
							clearInterval(inter);
						}
				}, 100);
			}
		},
		initKeyEvents : function() {
			var context = this;
			$(document).keydown(function(e) {
				if (e.keyCode == 39) {
					// right arrow
					context.nextImage();
					context.slideshow.stop();
				} else if (e.keyCode == 37) {
					// left arrow
					context.prevImage();
					context.slideshow.stop();
				}
				;
			});
		},
		initNextAndPrev : function() {
			this.next_link = $('<div class="ad-next"><div class="ad-next-image"></div></div>');
			this.prev_link = $('<div class="ad-prev"><div class="ad-prev-image"></div></div>');
			this.image_wrapper.append(this.next_link);
			this.image_wrapper.append(this.prev_link);
			var context = this;
			this.prev_link.add(this.next_link).mouseover(function(e) {
				// IE 6 hides the wrapper div, so we have to set it's width
				$(this).css('height', context.image_wrapper_height);
				$(this).find('div').show();
			}).mouseout(function(e) {
				$(this).find('div').hide();
			}).click(function() {
				if ($(this).is('.ad-next')) {
					context.nextImage();
					context.slideshow.stop();
				} else {
					context.prevImage();
					context.slideshow.stop();
				}
				;
			}).find('div').css('opacity', 0.7);
		},
		initBackAndForward : function() {
			var context = this;
			//console.log("settings=" + this.settings);
			if(this.settings.nav_custom) {
				this.scroll_forward = $("#" + this.settings.nav_custom.div_forward);
				this.scroll_back = $("#" + this.settings.nav_custom.div_back);
				this.scroll_forward.addClass("ad-forward");
				this.scroll_back.addClass("ad-back");
			} else {
//				this.scroll_forward = $('<div class="ad-forward"></div>');
//				this.scroll_back = $('<div class="ad-back"></div>');
//				this.nav.append(this.scroll_forward);
//				this.nav.prepend(this.scroll_back);	
				return;
			}
			var is_vertical = this.settings.thumb_vertical == true;
			var has_scrolled = 0;
			var thumbs_scroll_interval = false;
			$(this.scroll_back)
					.add(this.scroll_forward)
					.click(
							function() {
								// We don't want to jump the whole width, since
								// an image
								// might be cut at the edge
								if(is_vertical){
									var height = context.nav_display_height-10;
									if (context.settings.scroll_jump > 0) {
										height = context.settings.scroll_jump;
									}
									var top;
									if ($(this).is('.ad-forward')) {
										top = context.thumbs_wrapper
												.scrollTop()
												+ height;
									} else {
										top = context.thumbs_wrapper
												.scrollTop()
												- height;
									}

									if (context.settings.slideshow.stop_on_scroll) {
										context.slideshow.stop();
									}
									context.thumbs_wrapper.animate({
										scrollTop : top + 'px'
									});
								} else {
									var width = context.nav_display_width-10;
									if (context.settings.scroll_jump > 0) {
										width = context.settings.scroll_jump;
									}
									var left;
									if ($(this).is('.ad-forward')) {
										left = context.thumbs_wrapper
												.scrollLeft()
												+ width;
									} else {
										left = context.thumbs_wrapper
												.scrollLeft()
												- width;
									}

									if (context.settings.slideshow.stop_on_scroll) {
										context.slideshow.stop();
									}
									context.thumbs_wrapper.animate({
										scrollLeft : left + 'px'
									});
								}								
								return false;
							})
					.css('opacity', 0.6)
					.hover(
							function(){
								$(this).css('opacity', 1);
							},
							function(){
								$(this).css('opacity', 0.6);
							}
					)
//					.hover(
//							function() {
//								var direction = 'left';
//								if ($(this).is('.ad-forward')) {
//									direction = 'right';
//								}
//								;
//								thumbs_scroll_interval = setInterval(
//										function() {
//											has_scrolled++;
//											// Don't want to stop the slideshow
//											// just because we scrolled a pixel
//											// or two
//											if (has_scrolled > 30
//													&& context.settings.slideshow.stop_on_scroll) {
//												context.slideshow.stop();
//											}
//											;
//											var left = context.thumbs_wrapper
//													.scrollTop() + 1;
//											if (direction == 'left') {
//												left = context.thumbs_wrapper
//														.scrollTop() - 1;
//											}
//											;
//											context.thumbs_wrapper
//													.scrollTop(left);
//										}, 10);
//								$(this).css('opacity', 1);
//							}, function() {
//								has_scrolled = 0;
//								clearInterval(thumbs_scroll_interval);
//								$(this).css('opacity', 0.6);
//							});
		},
		_afterShow : function() {
			this.gallery_info.html((this.current_index + 1) + ' / '
					+ this.images.length);
			if (!this.settings.cycle) {
				// Needed for IE
				this.prev_link.show().css('height', this.image_wrapper_height);
				this.next_link.show().css('height', this.image_wrapper_height);
				if (this.current_index == (this.images.length - 1)) {
					this.next_link.hide();
				}
				;
				if (this.current_index == 0) {
					this.prev_link.hide();
				}
				;
			}
			;
			this.fireCallback(this.settings.callbacks.afterImageVisible);
		},
		/**
		 * Checks if the image is small enough to fit inside the container If
		 * it's not, shrink it proportionally
		 */
		_getContainedImageSize : function(image_width, image_height) {
			if (image_height > this.image_wrapper_height) {
				var ratio = image_width / image_height;
				image_height = this.image_wrapper_height;
				image_width = this.image_wrapper_height * ratio;
			}
			;
			if (image_width > this.image_wrapper_width) {
				var ratio = image_height / image_width;
				image_width = this.image_wrapper_width;
				image_height = this.image_wrapper_width * ratio;
			}
			;
			return {
				width : image_width,
				height : image_height
			};
		},
		/**
		 * If the image dimensions are smaller than the wrapper, we position it
		 * in the middle anyway
		 */
		_centerImage : function(img_container, image_width, image_height) {
			img_container.css('top', '0px');
			if (image_height < this.image_wrapper_height) {
				var dif = this.image_wrapper_height - image_height;
				img_container.css('top', (dif / 2) + 'px');
			}
			;
			img_container.css('left', '0px');
			if (image_width < this.image_wrapper_width) {
				var dif = this.image_wrapper_width - image_width;
				img_container.css('left', (dif / 2) + 'px');
			}
			;
		},
		_getDescription : function(image) {
			var desc = false;
			if (image.desc.length || image.title.length) {
				var title = '';
				if (image.title.length) {
					title = '<strong class="ad-description-title">'
							+ image.title + '</strong>';
				}
				;
				var desc = '';
				if (image.desc.length) {
					desc = '<span>' + image.desc + '</span>';
				}
				;
				desc = $('<p class="ad-image-description">' + title + desc
						+ '</p>');
			}
			;
			return desc;
		},
		/**
		 * @param function
		 *            callback Gets fired when the image has loaded, is
		 *            displaying and it's animation has finished
		 */
		showImage : function(index, callback) {
			if (this.images[index] && !this.in_transition) {
				var context = this;
				var image = this.images[index];
				this.in_transition = true;
				if (!image.preloaded) {
					this.loading(true);
					this.preloadImage(index, function() {
						context.loading(false);
						context._showWhenLoaded(index, callback);
					});
				} else {
					context.loading(false);
					this._showWhenLoaded(index, callback);
				}
				;
			}
			;
		},
		/**
		 * @param function
		 *            callback Gets fired when the image has loaded, is
		 *            displaying and it's animation has finished
		 */
		_showWhenLoaded : function(index, callback) {
			if (this.images[index]) {
				var context = this;
				var image = this.images[index];
				var img_container = $(document.createElement('div')).addClass(
						'ad-image');
				var img = $(new Image()).attr('src', image.image);
				if (image.link) {
					var link = $('<a href="' + image.link
							+ '" target="_blank"></a>');
					link.append(img);
					img_container.append(link);
				} else {
					img_container.append(img);
				}
				this.image_wrapper.prepend(img_container);
				var size = this._getContainedImageSize(image.size.width,
						image.size.height);
				img.attr('width', size.width);
				img.attr('height', size.height);
				img_container.css({
					width : size.width + 'px',
					height : size.height + 'px'
				});
				this._centerImage(img_container, size.width, size.height);
				var desc = this._getDescription(image, img_container);
				if (desc) {
					if (!this.settings.description_wrapper) {
						img_container.append(desc);
						var width = size.width
								- parseInt(desc.css('padding-left'), 10)
								- parseInt(desc.css('padding-right'), 10);
						desc.css('width', width + 'px');
					} else {
						this.settings.description_wrapper.append(desc);
					}
				}
				;
				this.highLightThumb(this.nav.find('.ad-thumb' + index));

				var direction = 'right';
				if (this.current_index < index) {
					direction = 'left';
				}
				;
				this.fireCallback(this.settings.callbacks.beforeImageVisible);
				if (this.current_image || this.settings.animate_first_image) {
					var animation_speed = this.settings.animation_speed;
					var easing = 'swing';
					var animation = this.animations[this.settings.effect].call(
							this, img_container, direction, desc);
					if (typeof animation.speed != 'undefined') {
						animation_speed = animation.speed;
					}
					if (typeof animation.easing != 'undefined') {
						easing = animation.easing;
					}
					//console.log(animation);
					if (this.current_image) {
						var old_image = this.current_image;
						var old_description = this.current_description;
						old_image.animate(animation.old_image, animation_speed,
								easing, function() {
									old_image.remove();
									if (old_description)
										old_description.remove();
								});
					}
					img_container.animate(animation.new_image, animation_speed,
							easing, function() {
								context.current_index = index;
								context.current_image = img_container;
								context.current_description = desc;
								context.in_transition = false;
								context._afterShow();
								context.fireCallback(callback);
							});
				} else {
					this.current_index = index;
					this.current_image = img_container;
					context.current_description = desc;
					this.in_transition = false;
					context._afterShow();
					this.fireCallback(callback);
				}
				;
			}
			;
		},
		nextIndex : function() {
			if (this.current_index == (this.images.length - 1)) {
				if (!this.settings.cycle) {
					return false;
				}
				;
				var next = 0;
			} else {
				var next = this.current_index + 1;
			}
			;
			return next;
		},
		nextImage : function(callback) {
			var next = this.nextIndex();
			if (next === false)
				return false;
			this.preloadImage(next + 1);
			this.showImage(next, callback);
			return true;
		},
		prevIndex : function() {
			if (this.current_index == 0) {
				if (!this.settings.cycle) {
					return false;
				}
				;
				var prev = this.images.length - 1;
			} else {
				var prev = this.current_index - 1;
			}
			;
			return prev;
		},
		prevImage : function(callback) {
			var prev = this.prevIndex();
			if (prev === false)
				return false;
			this.preloadImage(prev - 1);
			this.showImage(prev, callback);
			return true;
		},
		preloadAll : function() {
			var context = this;
			var i = 0;
			function preloadNext() {
				if (i < context.images.length) {
					i++;
					context.preloadImage(i, preloadNext);
				}
				;
			}
			;
			context.preloadImage(i, preloadNext);
		},
		preloadImage : function(index, callback) {
			if (this.images[index]) {
				var image = this.images[index];
				if (!this.images[index].preloaded) {
					var img = $(new Image());
					img.attr('src', image.image);
					if (!this.isImageLoaded(img[0])) {
						this.preloads.append(img);
						var context = this;
						img.load(function() {
							image.preloaded = true;
							image.size = {
								width : this.width,
								height : this.height
							};
							context.fireCallback(callback);
						}).error(function() {
							image.error = true;
							image.preloaded = false;
							image.size = false;
						});
					} else {
						image.preloaded = true;
						image.size = {
							width : img[0].width,
							height : img[0].height
						};
						this.fireCallback(callback);
					}
				} else {
					this.fireCallback(callback);
				}
			}
		},
		isImageLoaded : function(img) {
			if (typeof img.complete != 'undefined' && !img.complete) {
				return false;
			}
			;
			if (typeof img.naturalWidth != 'undefined' && img.naturalWidth == 0) {
				return false;
			}
			;
			return true;
		},
		highLightThumb : function(thumb) {
			this.thumbs_wrapper.find('.ad-active').removeClass('ad-active');
			thumb.addClass('ad-active');
			if (this.settings.thumb_opacity < 1) {
				this.thumbs_wrapper.find('a:not(.ad-active) img').fadeTo(300,
						this.settings.thumb_opacity);
				thumb.find('img').fadeTo(300, 1);
			}
			if(this.settings.thumb_vertical != true)
				{
					var left = thumb[0].parentNode.offsetLeft;		
					//console.log("left" + left + ",this.nav_display_width=" + this.nav_display_width + ", thumb[0].offsetWidth=" + thumb[0].offsetWidth);
					left -= (this.nav_display_width / 2) - (thumb[0].offsetWidth / 2);
					//console.log("scroll left=" + left);
					this.thumbs_wrapper.animate({
						scrollLeft : left + 'px'
					});
				}
			
		},
		fireCallback : function(fn) {
			if ($.isFunction(fn)) {
				fn.call(this);
			}
		}
	};

	function AdGallerySlideshow(nextimage_callback, settings) {
		this.init(nextimage_callback, settings);
	}
	;
	AdGallerySlideshow.prototype = {
		start_link : false,
		stop_link : false,
		countdown : false,
		controls : false,

		settings : false,
		nextimage_callback : false,
		enabled : false,
		running : false,
		countdown_interval : false,
		init : function(nextimage_callback, settings) {
			var context = this;
			this.nextimage_callback = nextimage_callback;
			this.settings = settings;
		},
		create : function() {
			this.start_link = $('<span class="ad-slideshow-start">'
					+ this.settings.start_label + '</span>');
			this.stop_link = $('<span class="ad-slideshow-stop">'
					+ this.settings.stop_label + '</span>');
			this.countdown = $('<span class="ad-slideshow-countdown"></span>');
			this.controls = $('<div class="ad-slideshow-controls"></div>');
			this.controls.append(this.start_link).append(this.stop_link)
					.append(this.countdown);
			this.countdown.hide();

			var context = this;
			this.start_link.click(function() {
				context.start();
			});
			this.stop_link.click(function() {
				context.stop();
			});
			$(document).keydown(function(e) {
				if (e.keyCode == 83) {
					// 's'
					if (context.running) {
						context.stop();
					} else {
						context.start();
					}
					;
				}
				;
			});
			return this.controls;
		},
		disable : function() {
			this.enabled = false;
			this.stop();
			this.controls.hide();
		},
		enable : function() {
			this.enabled = true;
			this.controls.show();
		},
		toggle : function() {
			if (this.enabled) {
				this.disable();
			} else {
				this.enable();
			}
			;
		},
		start : function() {
			if (this.running || !this.enabled)
				return false;
			var context = this;
			this.running = true;
			this.controls.addClass('ad-slideshow-running');
			this._next();
			this.fireCallback(this.settings.onStart);
			return true;
		},
		stop : function() {
			if (!this.running)
				return false;
			this.running = false;
			this.countdown.hide();
			this.controls.removeClass('ad-slideshow-running');
			clearInterval(this.countdown_interval);
			this.fireCallback(this.settings.onStop);
			return true;
		},
		_next : function() {
			var context = this;
			var pre = this.settings.countdown_prefix;
			var su = this.settings.countdown_sufix;
			clearInterval(context.countdown_interval);
			this.countdown.show().html(pre + (this.settings.speed / 1000) + su);
			var slide_timer = 0;
			this.countdown_interval = setInterval(function() {
				slide_timer += 1000;
				if (slide_timer >= context.settings.speed) {
					var whenNextIsShown = function() {
						// A check so the user hasn't stoped the slideshow
						// during the
						// animation
						if (context.running) {
							context._next();
						}
						;
						slide_timer = 0;
					};
					if (!context.nextimage_callback(whenNextIsShown)) {
						context.stop();
					}
					;
					slide_timer = 0;
				}
				;
				var sec = parseInt(context.countdown.text().replace(/[^0-9]/g,
						''), 10);
				sec--;
				if (sec > 0) {
					context.countdown.html(pre + sec + su);
				}
				;
			}, 1000);
		},
		fireCallback : function(fn) {
			if ($.isFunction(fn)) {
				fn.call(this);
			}
			;
		}
	};
})(jQuery);